<template>
  <div id="app">
    <router-view></router-view>
  </div>
</template>

<script>
export default {
  name: "App",
  components: {},
  created() {
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store")) {
      this.$store.replaceState(
        Object.assign(
          {},
          this.$store.state,
          JSON.parse(sessionStorage.getItem("store"))
        )
      );
    }

    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload", () => {
      sessionStorage.setItem("store", JSON.stringify(this.$store.state));
    });
  },
  beforeDestroy() {
    sessionStorage.removeItem("store");
  },
};
</script>

<style>
* {
  margin: 0;
  padding: 0;
}
#content {
  width: 375px;
  margin: 0 auto;
  margin-top: 5px;
  padding: 5px;
  box-sizing: border-box;
  overflow: hidden;
}
.beian {
  text-align: center;
}
</style>
